There is one practical point in cross pollenizing flowers that I have recently learned. Pollen of one variety may not combine with the ovule of another variety or species but may stimulate the ovule to go on and develop all alone, without taking to itself the added pollen. That is a very important point, and possibly a new point. I was deceived, and reported that I had crosses of certain trees, and that such hybrids were growing. I knew that the flowers of parent trees had been properly protected from their own pollen. Now when these young trees are two years of age, I find they are true to one parent type; so true that they are evidently not hybrids. They have developed from the pistillate parent only. In ordinary parthenogenesis the fruit grows without any pollen influence at all. This forced parthenogenesis which I have described seems to be a phenomenon with which botanists are unfamiliar. Until I learn that it has been described and named by others I shall call it Allergic Parthenogenesis (Allos, ergon). The pistillate flowers accept absolutely no pollen, but go on and develop because of its impulse given. In cross pollenizing flowers, I find one point of great practical consequence. When covering the female flowers with paper bags to protect them from their own pollen you give protection to a great number of insects. The insects remain inside these bags and destroy the leaves and flowers. They are protected there from their enemies, predatory insects and the birds. When the bags are taken off, perhaps a week later, for the purpose of adding pollen to pistillate flowers, insects may have destroyed the leaves and even the flowers. Consequently, I find it best to sprinkle the leaves with Persian insect powder and to put some of it in the bags that are to cover the flowers. Insects can't live in an atmosphere of this insect powder. They sneeze themselves to death. I have taken the bags from leaves and flowers which were so badly injured by insects you could distinguish them at a considerable distance. Those are all the points that I jotted down for this address today, but no doubt many other points will be brought out in the subsequent discussion. MR. MCCOY: I would like to inquire how far it is possible under a microscopic examination to determine the species of the pollen. DR. MORRIS: It is possible to determine the species but not the variety so far as I know. It may be possible to determine a variety but I don't know the extent to which that is possible, from microscopic examination of the pollen. If we wish to know whether pollen is still good or not we may in twenty-four or forty-eight hours cause it to "sprout," and in that way know whether it is viable and good. We may save ourselves a good deal of trouble by making this examination and determining whether or not a given lot of pollen is viable before putting it on the flowers. We can cause it to sprout in a sugar solution.